Lin Wan, a senior girl in the Qingbei Affiliated High School, was isolated by the whole school because of her poor family. Only the school boss Shen Yan took the initiative to approach and protect her secretly. After the two secretly fell in love, Shen Yan pretended to alienate in order to protect the family marriage, and even connived at Green Tea's classmate Su Man to humiliate Lin Wan in public for "sleeping to get to the top", causing her to drop out of school due to depression. Three years later, Lin Wan returned to her alma mater for graduate school with a full scholarship. Shen Yan had become the heir to the Shen Group, but became her classroom assistant, library attendant, and even blocked the coffee poured by Su Man for her. He never explained the past, only waited day by day - until Lin Wan found 300 apology letters he had not sent back then in the middle of the old textbook, and the last one read: "The day you dropped out of school, I signed the agreement to give up my inheritance rights."